Thrust bearing

Abstract

In a thrust bearing, an axially outer end portion of each pin of a pin-type retainer is fixed to an outside ring by a weld, and a threaded shaft, formed at an axially inner end portion of each pin, is screwed into a threaded hole formed in an inside ring. An inner peripheral surface of the inside ring slides on an outer peripheral surface of a rotary shaft, whereby the rotation of the pin-type retainer is guided.

The invention claimed is: 
     
       1. A thrust bearing comprising:
 a first raceway member that has an annular first raceway surface and of which an inner periphery is fitted to a shaft element; 
 a second raceway member that has an annular second raceway surface facing the first raceway surface of the first raceway member in an axial direction and that is rotatable with respect to the first raceway member; 
 a plurality of rolling elements that are rollably arranged between the first raceway surface of the first raceway member and the second raceway surface of the second raceway member; and 
 a pin-type retainer that includes pins each passing through a corresponding one of the rolling elements concentrically with an axis of the rolling element, an outside ring that is arranged on an outer side of the rolling elements in an axial direction of the rolling elements and that is connected to one end portion of each of the pins, and an inside ring that is arranged on an inner side of the rolling elements in the axial direction of the rolling elements and that is connected to the other end portion of each of the pins, wherein 
 the one end portion of each of the pins is fixed to the outside ring by a weld and the other end portion of each of the pins is screwed to the inside ring, and 
 an inner peripheral surface of the inside ring serves as a guide surface that slides on the shaft element to guide rotation of the pin-type retainer. 
 
     
     
       2. The thrust bearing according to  claim 1 , wherein the guide surface is in line contact with the shaft element. 
     
     
       3. The thrust bearing according to  claim 1 , wherein each of the rolling elements is a roller, and the thrust bearing is a roller thrust bearing.